Abstract
AbstractIn Japan, large and small power systems were interconnected over time and thus ultimately grew into a large‐scale national power system. A highly important stability problem arising from large‐scale power system interconnections is low‐frequency oscillation (about 0.3 Hz to 0.5 Hz) of interconnected systems. The ΔP‐type PSS has been applied to all generators in trunk power systems as a measure to improve the damping of local mode oscillation (about 1 Hz). However, it is difficult for this PSS to improve the damping of low‐frequency oscillation because of the hardware and the design of PSS control constants. Therefore it has become necessary to develop a new two‐input PSS.This paper explains the development of this two‐input PSS and the study of a low‐frequency oscillation model. This paper can be summarized as follows: (1) The effect of control over low‐frequency oscillation is affected by the kinds of PSS detecting signals. The Δω‐type or Δf‐type detecting signals used for lead‐phase compensation are suitable for this purpose. (2) It is possible to cause low‐frequency oscillation studies in a one‐machine infinite‐bus power system model with medium loads. (3) According to the simulation of a three‐machine and actual large‐power system models, dynamic stability was largely increased by this two‐input PSS used for generators.
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